Interesting take on the theme of passage, I really enjoyed the clever use of the damage and invincibility mechanics. Damage boosting as a concept isn't really explored outside of speedrunning to the best of my knowledge but the idea of making a puzzle game out of it was quite smart. Also neat idea to take the idea of passage as the passage from birth through life.
One piece of critique I have is that the music loop is quite repetitive, a longer loop would have been nice.